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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2b412979c51b504c6b66f7d5b005c5f8c1707fe1d6a1ae66e1eb32e136486a' 
  AND token = 'OgnNYRARRWc8k2nvs0tFFVfKbKd9EswzWC776QX7xLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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