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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44df3dda9499fc9e50c31ac1507cce264a012c2bfc4ada451958830f008f4e2a' 
  AND token = 'wVO0gZkFFik7l55u7+KhgujHlIfbvK4+Zc1HJBEe7XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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