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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f74bde0c20df717188cec22243599f369b7d4994fca4c9f51ae99d9f5ee6f31' 
  AND token = 'aW3bSr1bA3AowvRi8kaIjCHz5hgz59OMNg0V6WYG7ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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