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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ac192977d1eb3e3a5d485fd7ad94b864068653db0e231647a2f1ef71bbc3bf' 
  AND token = 'uL8AoinaWQixfgK9v7DjSvuUAh66Y1fgOQeiFMa1LcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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