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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17c5ba09d97a1e7ae819234244eda18171e5a05e68ecb9d765289a3d5211eea' 
  AND token = 'i/ynPslcr6pzS8wpQ0apbOWqEoNCWB67dO1HNK/cvww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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