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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31852e27625422c3bdc54388f66d48de6893b04f6cc7c1c3d2a05356b67299ed' 
  AND token = '2V5doZxeYYDn8B7LO936udQP1+2Tt307nvtMYibhfWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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