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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cd13c0a53668c90e1980092549af4bab0e9c723e56d18f98046c4271d433b5' 
  AND token = 'jVfM5Io2rAm5oMlC6Y2zML4aVF31hwHikQdCMczppsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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