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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb66aa40929685ba4fb5afc9e115f9db67c6c88965c2ee644a620e05e1a849e' 
  AND token = '4d8AbAp3gQ3ZvSeSaPo0ODPg8WZ1WX3JvYGB1ZxoLVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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