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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a203c2a5a0e8362ef0ef79ddb4e387e6150f86b4d530cf9e98aa25b6b1bbeaa' 
  AND token = 'n9rHkBoYSaurYwgx3guHkP7K42CvJl3uTv3q/ilw2sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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