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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a0374ffb4e141316949e17832e191b77bb38cd34c744698eddad5f42b0ca5c' 
  AND token = 'nt1ejkG6Mw2T26d3mxTbSe73sJeFk8oxNaBzUK/h4Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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