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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3632edddd391c3e87fc545ea789bcbb22d5625e8015bd0a56112afb32c8cf0c' 
  AND token = 'opN/u9EyF0Q9ULh9oDGdl0fxnLsxgB9emfAgfMYXxQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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