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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4116b8d4736f48a1f31d9722f440506f143d20cbacfa65c7dd10ffeb0eb399' 
  AND token = '0Cw8448qZ8KOK2B+QBTe2HF6l+rBWeg1D/HSFln+xC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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