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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1be4a5a32f324dec4f4b19e64784b92980161df816610361b76a570eb6ba3d2' 
  AND token = 'zdc5cV3TIQlJZJ+mGEm8ZfrNo0/5M23cMwRWI1JpQpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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