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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9f6828c02c231601da10d9fab0408d37f4318ec457bb49eb6f3b4f539f1d0e' 
  AND token = 'jzooViDo2HJnVTjLn2OtudzPvypYS1yEdxwr48QjVr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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