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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58d86e6a8741468f9ed380af2c2f6a41f302f65914afaa8a88b77e8f38541df' 
  AND token = 'K8Wr09CDoBT9wZT4U372sDGM5beH3rkWieCfw9H/qUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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