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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a480a02a57e348e623414f7e6bb22816921341f6823a3c9fa329a245f2d4accb' 
  AND token = 'D6ucdgCLXbYdGKDY8Srxcka2GIE4FPUQgr505SjdlCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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