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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f11da7e8b6bc3acc8695235e3cf661ca5d3d10e7fa00f950dd5490e8e1255e' 
  AND token = 'Heu7JyaZE6hZ2JSZRKo2fBAC2gX5VvVZiPfa1Hm6U+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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