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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ea15fbce3ad2ef685b8ae9360b75466f253e0e0ce030bcb2d35d45129ed35c' 
  AND token = 'AFBZ4H7Lnm7ZbPjJtYBU/tB2hRKm0NLkwpycNYv57b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}