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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6159c8b2c7bc353ea194ccd54f29fdb47cb466d7def46277bf5d3d759d3af68' 
  AND token = 'a8cL7ThYq991GHLoxPCLE3DeDy5TPVYO7NQsv0DvC4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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