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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc4bb456b18832061cb1f7260aac3e62a2650e11d1f1cbb85953aaf0fec0784' 
  AND token = 'Eu2yNQIJvWuQxslDOp88a1ylolO+LNm4I3QrDeKBnN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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