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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471472c658a2703544513fe1736ce25db2b27e32666793160084fe7239c05ab1' 
  AND token = 'a0sBxzhk5Gy60aVaT6A8+ByAlH/BOW/PYu/sIRxwSEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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