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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b2e08da479d9ee9436f488b8bc93e5c339147525712330c49ccc7927cd3da0' 
  AND token = 'UqwOVXotGPk3KBM64GMp+ni1DipSLfd5iZXi623Jitc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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