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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '382381b06d6b2a0f1308aeac6cc37c5cba4ba417d46d7b1d572376e051b22c33' 
  AND token = 'deMUlMFd/OwTWzXoA+2vNn3qTYeKQnDCbBFBM3ndHZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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