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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e969c3f070427bcacede479490d82b3be9c35e040bae10be8c1738753c0bdca' 
  AND token = 'fk0q6gwIbZk7f0s3p+xJ0hE9MTgwoLwidCpP9y5IVHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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