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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9bb647c82b52ba3811e490bff504db9f393a7a32087eabb8be1c5d6da6c4cc' 
  AND token = '9mr3le8pvCwprBDtF6DSziOGXOnblqc2eLRDRxRsc+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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