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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db71e8d8c21a04fcfa44e912a8ad8c9ff568f0136992f9c26ba8e6767ccc755c' 
  AND token = 'vbn7zCG/Q9Ku+m8Jpiojym84i/TMojUhTuJ61LamUoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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