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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec6e4f9d3748cb69781d39576f3de3dc909fd6d16a55073b26a30bbe868df23' 
  AND token = 'IVw6EpW1P0mXenJp6YvIV5rdrA/ts50TbMPtaJcjUP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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