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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e029594dd983f1e246e1422e97bfc4f713ed6686c8c4b3abe130336379ec8b92' 
  AND token = 'AG4Pa2hUbH0JeEP8JOIXHm2clLE40I4g+EAv033ct5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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