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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa80d35bbe0855000993e68c6d16e7fa84edc0c909dbb4cda1870df461ab25a8' 
  AND token = '9l0AMeP+8eiBddX7FSlDWZVC6270CsltRoOnh9kQz+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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