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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca66d5bad3577ae986181f52da8c966543709b68a278ff52a2ac4d97474d442' 
  AND token = 'zEJpImp0HI1jabvbl57uo7bVIQdAgT8CKuTpJaqZiqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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