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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac6dba9cd642e5bc73440b0a756c9d1585f9cb12cd23640c998bffbf7a34587' 
  AND token = 'Kcc/dloOWeoo4M8IXzndJhJKnB9LTtNLZP8x5Pumvm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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