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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6f0e146ff424eeeee6ddfb0be428a1517b67ad5da1ac031089844f460e3104' 
  AND token = 'LpyrK9A0nJeCmmbaLqBm1eJZ01rzGz/QFTpWi/Pf1NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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