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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a5148b4db9f4e9e5d058f6cbe73e34163fe01689a1b6d94bfee03e470bbabd' 
  AND token = 'dOCGXaB+qXLx8AkcJwa+bTYej/s+q0VLZYnmnGdeFC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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