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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f07d3724e3b4a5882104e21772494e4795183be7ebd9394d8aecda2ffa2de9c' 
  AND token = '/1EdKcfZ3N1e1fmI1MUGzTQHhW07Huoj6fzMd8NDb7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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