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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99ccaa2cf4be75b692792f309a99dee73eeee075ec48304c3e2b67e50d09aef' 
  AND token = '8iUD9Z+PzZlrorUd9Im8nVQimCxTXf1J99S3VD30Nr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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