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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7b4ca7c57c6091f997aa3e67fcf4c6ff1605e315a02a45c40dd17db5fead13' 
  AND token = 'R2epYuPk3oFIu2AQMQ6nCNlLu6MzdagXvUrTZAbHRV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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