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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca6953d3d17d5f25571da0830f2a8ee71de988027594414880d8c024c48562e' 
  AND token = 'jgWjyosa9KfwEPa3XdyEA//22vjrs0SD9ivAU/plf+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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