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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5961cd9044b8c608cb59bcce0ae37acb7c461c558112f5595372d4f1e36f0c' 
  AND token = 'nsn2qvFMqeJHv2kclX0AcvSaV2/lILND/i1mOO62CP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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