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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d7fbd4fee39da4f1550871198b245ddd14feafaa5b909c166b3f6bd41c7523' 
  AND token = 'vpunEA5/VPoC9lDLNEpGP4slNSh0TYQdgSGWfrC32jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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