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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd560ca25f6413c6f7ccd79588fb8e25da5f147ba2e7d670d3a5eebc8d9203e74' 
  AND token = 'rZ2QfTZprsZWCwewf9jk7vvIrbVpFjkWU721GexlF6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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