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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60bc693180b84f62fc5ad16edd3ae46d7b95eb21f4847e938c788a2694d0c13' 
  AND token = 'g24bxh0pG2xObcG8fVfyAH3xXymX0QoT8v6/WyubkyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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