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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6610fabf7ed63b5b8bb7ba3df0ce3c84570bb78f99c9ac4e72952dba9842dff' 
  AND token = 'brgjFD/ZC0fwV2o+aE5KS4lrevlv+mRRZK2sR8AEwBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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