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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515b0d14b88faf5c10e0d6bc224a92ed7783240a2743495dac8926a59e713c1d' 
  AND token = 'SM6WNbiEP/NKreQugMNho1h2Kd4ASkjkJ/zbm/IBUZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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