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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392b0937616de9f402afd2fa77522b61e389e828f2c34d8f33938ce662f85ac1' 
  AND token = 'AXVfPkGQ705KlJa4/OrkHtAHN2IQNw892iY/DQ69P9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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