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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09a9d0265b29480d2b94cbc6ecb8e02dfba631d53d67da5675acbe0b8673771' 
  AND token = 'uPbToJDIT1u+72HhRXGKvyiJEnUKY4rDA3dJ671bNcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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