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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0ef4a9f2772748effcea1d40d9c52ec9ddfa87d0ee6bc9fc607e67209d79a9' 
  AND token = 'LzyeTKMDaup3wYSmAngjQNTt3e92jMdDhgfV/7Lpsuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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