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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aaebea53294ba6c99d7e857a46de931e9b19f35f0c9f99324d8da8b71a0e428' 
  AND token = 'Ko3pP5NMg3mlZPIbcqX4HC/SfzN55Zgl3k3gWm2UdtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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