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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2de9920c02b2c8401dd5a9f95ac44d47abc91856cd05c3c79779d0356b42b3' 
  AND token = 'n7m16V2qydj6pf6jXNpnbA8dO33LYl6i8UWI4SOfiiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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