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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961c8522974c64f8e2a9f763248060b83f46897b71958c37d9b0cb57573410f9' 
  AND token = 'RlfPe4xpOEacxc26BcrZNJzCKwFrP70rxEcfA2OJDYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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