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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcf305f9dc0dfbc6ed07bab8468a516270729c8474eb417a92dea1f77ce0e4d' 
  AND token = 'ZZXVwGdLSjku2rjIKQ7eqKA4agd3J7ROs7Y71Qqfy70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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