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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa28e082d46e950b5d2b27eb9a5228e591d73e1419af3dcb421b2f515eff4f8' 
  AND token = '1oPqDiY903yWBpf3+EkmzNub03xMXbmGGedETSwLtPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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