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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57f2dce4fe5ae262d30079c3cde1510b2b69b1fa8c446d2c7b24fc9a8a72b10' 
  AND token = 'mo05QS4t6Gdag9PrxgUAsTCz07mpb7iV2bYKYIW1EU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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