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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a2f949f28e888b9bf9ad56c68353a8e6eb6cee71b37785f36e6b234d7750ba' 
  AND token = 'YvOTEFsrvXfBCB4D16yeFHwRmxAB8Yr05T5f05ITSMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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