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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fae236584cace111a3abd4a928c797ad791315feec8d0350a923107e817e14d' 
  AND token = '02f42V3bDdlYvJKnX9igACKaHw1ooM3xxg+dDLKK4wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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