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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cd505054fe4474d4cd5b6d6a1c340191b63bafb2fdd6aaf0afb783bfe45ec1' 
  AND token = 'nvmDDbq9wh0zceN8YsGFz1DgIZVTwaXm7e8mm6fFVRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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