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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cda2d29b6da9aef66789d90138e36d6c30def0700ec6f716d843afad2c841eb' 
  AND token = 'EZg2mJc1fllm3JZ5wb4nMoZ4jzEQMmNgWxefSwuOwwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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