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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b1706d6fe5c69d0835de0b9dce8fe92ce16d6433d0d89a6747295a7f8a2f0a' 
  AND token = 'IBdDt1FDQic1CSafAhL3XXUDm/5HoeXOzse5HvgpZC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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