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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895f9a230acc511919e4e7ef411786bc15a93807516c2730ca7a08f012e3f42d' 
  AND token = 'vl69KIvWpPvCdVyrrv2QbpfSSIgD9MStl0oFlxQ1FIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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