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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9ed37f0e24656b9e6d6a9a941f3de0125ed32f1c3da7b4b7ac43ebf729c2f1' 
  AND token = 'sJa6pq5PLxIPozAaKHoAOz3yTE7EqJKfkDEX7q+plj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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