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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30e286c741a98c2f7f8d6a4d8ea74eea0d827c7944010e4a55f48aadcba8b08' 
  AND token = 'B7wxl6JaI2CFMsIVG+g4zRgLp7qTd8v+UdK5kFIigqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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