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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c9a45f0ac60f648a0c42d3918196dbaeaae647d80aea3d89d58f4b0eeed36e' 
  AND token = 'claOWnubsj+d9KMGGXY5OCKlwiXUYCy5CwTZxdzSmI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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