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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27f946955ce4ee34462b6422eaf337e2e2b542f32844c180a5dce00280a9aaa' 
  AND token = 'PAZnjzsyGf98IYE12gLy4rjHkL5Kig9cZ8FjbYGseq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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