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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41612a68eab62203796513450d2fbb5c976e105220bff544e5423dbb75beaea' 
  AND token = 'UJdzxdTk/Pd8DnNN+yX+CejxT0La2pJ4enZ159CypcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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