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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c5e085c339f70d5fd30bb092b0c612a88fc1bdd60dfa33a5ca8ca8224c08cf' 
  AND token = 'CGR3y6WfXRRT+SBcPaiBSAI82JU03vhQt741d9U3RjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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