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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa61d268e363758902dede9079ea15659480a0f9eb9c24c7d2434c957f6dc8b6' 
  AND token = 'p/FLTahjnX852DKnK04WlewVouU2IMBI4Cd7OiEMNoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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