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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113cee7f3c16a87b5773e9cb9a27c23bc74f03ca9ca114dd4b4908fe39e7a42c' 
  AND token = 'K7abyK1QMRuICepWhtKkc1ZXFojZ/rpPw221kXEUQcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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