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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d42f5b7c16a9f97820c5e794c2ba658508505be780eff9879b5fd8cedf80d5d' 
  AND token = 'QLOnKZA4aNNqyldOx12b/9EarM4VQJXeckpN3BQI3WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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