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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ad9478743b8b3bddab49c490bfce4dc079fc95def640d06584115fb76f53fd' 
  AND token = 'mwLEHvTk6W06B6mLh9IuOrdOtTIdAMdmtElghBr/Btg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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